16
ES SPLIT INSTALLATION MANUAL
Leak Testing
The refrigeration line set must be pressurized and checked for leaks
before purging and charging the unit. To pressurize the line set, attach
refrigerant gauges to the service ports and add an inert gas (nitrogen or
dry carbon dioxide) until pressure reaches 60 to 90 PSIG. Never use
oxygen or acetylene to pressure test. Use an electronic leak detector or
a good quality bubble solution to detect leaks on all connections made in
the fi eld. Check the service valve ports and stem for leaks and all connec-
tions made in the fi eld. If a leak is found, repair it and repeat the above
steps.
For safety reasons do not pressurize the system above 150
psi
. Purge pressure from line set. The system is now ready for evacuat-
ing and charging.
System Evacuation
Ensure that the line set and air coil are evacuated before opening ser-
vice valves to the split unit. The line set must be evacuated to at least 200
microns to remove moisture and air that may still be in the line set and coil.
Evacuate the system through both service ports to prevent false readings
on the gauge because of pressure drop through service ports.
Charging the System
Total Charging Method -
See table on page 15 for the factory charge
and total charge of the split units. For line sets, add the specifi ed refriger-
ant to the factory charge for every installed foot of liquid line over 25 feet.
Example:
Model ES048 with 29 feet of installed liquid line (3/8-inch
O.D.). The factory charge of an ES048 is 116 oz. plus 4 feet of liquid line x
0.50 oz. per ft. = 2.0 oz. + 116 oz. =
118.0 oz
. (Total Charge). The ES048
is shipped from the factory with 116 oz. of refrigerant; the amount to be
added is 118.0 oz. - 116 oz. =
2.0 oz
.
Add the required refrigerant so that the total charge calculated for
the unit and line set is now in the system. Fully open the service valves
by turning counterclockwise. Start the unit in heating mode and measure
superheat and subcooling values after at least fi ve minutes of run time.
See page 20 for examples of measuring superheat and subcooling perfor-
mance values. After values are measured, compare to tables on pages 21
and 22 and go to FINAL EVALUATION.
Partial Charge Method -
After purging and evacuating the line set,
fully open the service valves counterclockwise. Add R-410A (liquid) into
the liquid line service port until the pressure in the system reaches ap-
proximately 200 PSIG. Never add liquid refrigerant into the suction side
of a compressor. Start the unit and measure superheat and subcooling.
Keep adding refrigerant until the unit meets the superheat and subcooling
values on pages 21 and 22.
Final Evaluation
After the initial check of superheat/subcooling values in the heating mode, shut off the unit and allow it to sit 3 to 5 min-
utes until pressures equalize. Restart the unit in the cooling mode and check the values against those in tables on pages
21 and 22. If the unit performs satisfactorily, charging is complete. If the unit does not perform to specifi cations, the charge
may need to be readjusted until the values are close. Adding refrigerant will increase subcooling. Recovering some of the
refrigerant will decrease subcooling and increase superheat. If the superheat/subcooling values are still not close to the
specifi cations in tables on pages 21 and 22, analyze refrigerant circuit operation.
Service ports for attaching
refrigerant gauges
Braze
Connections
Suction Line
Liquid Line
Replace caps after
adjusting service valves
Figure 10: Typical Split System Refrigerant
Line Connections
Refrigeration (cont.)
